US20210059866A1 - Elastic entrapment with waist cap bonding - Google Patents

Elastic entrapment with waist cap bonding Download PDF

Info

Publication number
US20210059866A1
US20210059866A1 US16/947,236 US202016947236A US2021059866A1 US 20210059866 A1 US20210059866 A1 US 20210059866A1 US 202016947236 A US202016947236 A US 202016947236A US 2021059866 A1 US2021059866 A1 US 2021059866A1
Authority
US
United States
Prior art keywords
web layer
web
folded
bonding
elastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US16/947,236
Other languages
English (en)
Inventor
Jeffrey W. Fritz
David E. Schuette
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Joa Curt G Inc
Original Assignee
Joa Curt G Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Joa Curt G Inc filed Critical Joa Curt G Inc
Priority to US16/947,236 priority Critical patent/US20210059866A1/en
Assigned to CURT G. JOA, INC. reassignment CURT G. JOA, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FRITZ, JEFFREY W., SCHUETTE, DAVID E.
Publication of US20210059866A1 publication Critical patent/US20210059866A1/en
Pending legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
    • A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7894—Means for handling of moving sheets or webs of continuously moving sheets or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a sinusoidal wave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B29C66/4332—Casing-in, i.e. enclosing an element between two sheets by an outlined seam by folding a sheet over
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/69—General aspects of joining filaments 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B29C66/81429—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
    • A61F2013/15861—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding
    • A61F2013/15869—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding with ultrasonic energy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • A61F2013/49025—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material having multiple elastic strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0046—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2555/00—Personal care
    • B32B2555/02—Diapers or napkins

Definitions

  • Embodiments of the invention relate generally to absorbent sanitary products and, more particularly, to an improved apparatus and method for manufacturing an elastic waist composite structure for use in an absorbent sanitary product that includes bonding the waist cap of the elastic waist without the use of consumable adhesives such as glue.
  • Absorbent sanitary products such as disposable diapers
  • absorbent sanitary products are typically equipped with elastic composite structures that include one or more elastic threads.
  • These elastic composite structures are positioned at various locations throughout the product, including in the waistbands, leg cuff regions, and throughout all or portions of the front or back panels of the product.
  • the elastic threads 12 are positioned in a tensioned state between a first web layer 14 and a second web layer 16 .
  • First and second web layers 14 , 16 are typically layers of non-woven materials or webs.
  • Elastic threads 12 are positioned in groups forming waist elastic 18 and belly elastic 20 and can contain more or less strands 12 than depicted in FIG. 1 .
  • first and second web layers 14 , 16 are bonded together around elastic threads 12 .
  • first and second web layers 14 , 16 are bonded together ultrasonically by an ultrasonic bonding system known in the art.
  • the second web layer 16 has an entrapment area 22 extending beyond the end of the first web layer 14 that is folded over to seal the waist elastic portion.
  • FIG. 3 illustrates application of an adhesive 24 in the area of the entrapment area 22 .
  • the adhesive 24 may be applied to the first web layer 14 in the region of the waist elastic 18 .
  • FIG. 4 illustrates the entrapment area 22 folded over the first web layer 14 and adhesively attached thereto to form a waist foldover or waist cap.
  • the tension in the elastic threads is subsequently released, causing the web material to pucker or fold in the areas that contain the adhered elastic threads and waist foldover.
  • an elastic composite structure includes a first web layer comprising a first portion, a second portion, and a third portion; a second web layer comprising a first portion and a second portion; and a plurality of elastic threads positioned adjacently to the second and third portions of the first web layer.
  • the first portion of the first web layer is folded over and overlaps the second portion of the first web layer.
  • the folded first portion of the first web layer is directly bonded to one of the second portion of the first web layer and the first portion of the second web layer.
  • a first portion of the plurality of elastic threads is constrained between the folded first portion of the first web layer and the second portion of the first web layer absent adhesive.
  • the third portion of the first web layer is directly bonded to the second portion of the second web layer and traps a second portion of the plurality of elastic threads therebetween.
  • a method of forming an elastic composite structure includes providing a first web layer comprising a first portion, a second portion, and a third portion; threading a plurality of elastic threads adjacently to the second and third portions of the first web layer; and providing a second web layer comprising a first portion and a second portion.
  • the method also includes folding the first portion of the first web layer over the second portion of the first web layer and bonding the folded first portion of the first web to one of the second portion of the first web layer and the first portion of the second web layer.
  • the method further includes bonding the third portion of the first web layer to the second portion of the second web layer.
  • a first portion of the plurality of elastic threads is trapped between the first and second portions of the first layer absent adhesive and a second portion of the plurality of elastic threads is trapped between the third portion of the first web layer and the second portion of the second web layer.
  • an apparatus for forming an elastic composite structure includes a plurality of rollers configured to guide a combined web assembly in a machine direction.
  • the combined web assembly includes a first web layer comprising a first portion, a second portion, and a third portion; a second web layer comprising a first portion and a second portion; and a plurality of elastic threads positioned between the first and second web layers.
  • the apparatus also includes a folding apparatus configured to fold the first portion of the first web layer over the second portion of the first web layer and a bonding apparatus configured to bond the folded first portion of the first web layer to one of the second portion of the first web layer and the first portion of the second web layer such that a first portion of the plurality of elastic threads is trapped between the folded first portion of the first layer and the second portion of the first layer absent adhesive.
  • the bonding apparatus is also configured to bond the third portion of the first web layer to the second portion of the second web layer such that a second portion of the plurality of elastic threads is trapped between the third portion of the first web layer to the second portion of the second web layer.
  • FIGS. 1-4 illustrate a prior art method of forming an elastic waistband with an adhesively-attached waist cap.
  • FIG. 5 is a schematic view of manufacturing line for making an elastic waistband according to one embodiment of the invention.
  • FIG. 6 is a cross-sectional view taken along line 6 - 6 of FIG. 5 .
  • FIG. 7 is a cross-sectional view taken along line 7 - 7 of FIG. 5 .
  • FIG. 8 is a cross-sectional view taken along line 8 - 8 of FIG. 5 .
  • FIG. 9 is a cross-sectional view taken along line 9 - 9 of FIG. 5 .
  • FIG. 10 is a schematic view of manufacturing line for making an elastic waistband according to another embodiment of the invention.
  • FIG. 11 is a cross-sectional view taken along line 11 - 11 of FIG. 10 .
  • FIG. 12 is a cross-sectional view taken along line 12 - 12 of FIG. 10 .
  • FIG. 13 is a cross-sectional view taken along line 13 - 13 of FIG. 10 .
  • FIG. 14 is a cross-sectional view taken along line 14 - 14 of FIG. 10 .
  • FIG. 15 is a schematic view of manufacturing line for making an elastic waistband according to another embodiment of the invention.
  • FIG. 16 is a cross-sectional view taken along line 16 - 16 of FIG. 15 .
  • FIG. 17 is a cross-sectional view taken along line 17 - 17 of FIG. 15 .
  • FIG. 18 is a cross-sectional view taken along line 18 - 18 of FIG. 15 .
  • FIG. 19 is a schematic view of manufacturing line for making an elastic waistband according to another embodiment of the invention.
  • FIG. 20 is a cross-sectional view taken along line 20 - 20 of FIG. 19 .
  • FIG. 21 is a cross-sectional view taken along line 21 - 21 of FIG. 19 .
  • FIG. 22 is a cross-sectional view taken along line 22 - 22 of FIG. 19 .
  • FIG. 23 is a schematic view of manufacturing line for making an elastic waistband according to another embodiment of the invention.
  • FIG. 24 is a cross-sectional view taken along line 24 - 24 of FIG. 23 .
  • FIG. 25 is a cross-sectional view taken along line 25 - 25 of FIG. 23 .
  • FIG. 26 is a cross-sectional view taken along line 26 - 26 of FIG. 23 .
  • FIG. 27 is a cross-sectional view taken along line 27 - 27 of FIG. 23 .
  • FIG. 28 is a schematic cross-sectional view of a bonding apparatus that is usable with the manufacturing line of FIG. 5, 10, 15 , or 19 according to one embodiment of the invention.
  • FIG. 29 is a detailed view of a portion of the bonding apparatus of FIG. 23 illustrating the horn aligned with an anchoring weld on the rotary anvil, according to one embodiment of the invention.
  • FIG. 30 is a flattened representation of an exemplary anvil pattern usable with the manufacturing line of FIG. 5, 10, 15 , or 19 according to one embodiment of the invention.
  • FIG. 30A is a detailed view of a portion of the rotary anvil of FIG. 30 .
  • FIG. 31 is a flattened representation of an exemplary anvil pattern usable with the manufacturing line of FIG. 5, 10, 15 , or 19 according to another embodiment of the invention.
  • a portion of an exemplary manufacturing line 26 for producing a composite web 28 is illustrated according to one embodiment of the invention.
  • a first web layer 30 and a plurality of elastic threads or strands 32 are fed in the machine direction 34 by a roller assembly 36 , which may include one or more rollers.
  • Elastic threads 32 includes a first group of elastic threads 38 (referred to hereafter as waist elastic threads) and a second group of elastic threads 40 .
  • composite web 28 is referred to hereafter as a waist web 28 and the first and second groups of elastic threads 38 , 40 are referred to hereafter as waist and belly elastic threads, respectively, it is contemplated that the techniques disclosed herein may be used to manufacture a composite web usable in other elasticized regions of an absorbent sanitary product, such as leg or leg cuff elastic regions, or in elasticized regions of other types of disposable garments.
  • Elastic threads 32 travel in the machine direction 34 under tension from a creel assembly (not shown) or similar device.
  • Elastic threads 32 may have any suitable cross-sectional shape that facilitates formation of an elastic composite structure having desired elasticity, visual aesthetic, and manufacturability.
  • elastic threads 32 may have a cross-sectional shape that is round, rectangular, square, or irregular as may be the case where each elastic thread 32 is a multifilament product.
  • the elastic threads 32 may be composed of any suitable elastic material including, for example, sheets, strands or ribbons of thermoplastic elastomers, natural or synthetic rubber, or elastic strands, as non-limiting examples.
  • Each elastic thread 32 may be provided in the form of an individual elastomeric strand or be a manufactured multifilament product that includes many individual elastomeric filaments joined together, such as by a dry-spinning manufacturing process, to form a single, coalesced elastic thread 32 .
  • First web layer 30 includes a waist elastic portion 42 configured to receive the waist elastic threads 38 and a belly elastic thread portion 44 configured to receive the belly elastic threads 40 .
  • first web layer 30 includes a foldover portion 46 configured to be folded over at least the waist elastic threads 38 and waist elastic portion 42 . Foldover portion 46 may also overlap a portion of the belly elastic thread 40 and the belly elastic thread portion 44 .
  • first web layer 30 and elastic threads 32 travel downstream to a folding assembly 48 such as a plow folder.
  • Plow folder 48 is configured to fold over the foldover portion 46 of first web layer 30 so as to overlap at least a portion of the waist elastic portion 42 and may extend to overlap a portion of the belly elastic thread portion 44 as well.
  • a first edge 50 of first web layer 30 is moved from being an outside edge of the first web layer 30 toward a second edge 52 on the other outside edge of the first web layer 30 .
  • foldover portion 46 overlaps the waist elastic portion 42 after the folding.
  • First and second web layers 30 include materials capable of fusing to another web layer as described below upon application of an applied energy that causes one or both of the web layers to soften or melt and join together without the use of an intermediate layer of adhesive material such as glue.
  • These facing pair of web layers 30 , 54 may be the same type of material or different materials according to alternative embodiments.
  • first and second web layers 30 , 54 may include nonwoven materials, woven materials, films, foams, and/or composites or laminates of any of these material types.
  • Second web layer 54 has opposing edges 56 , 58 , and as illustrated in the embodiment shown in FIG. 5 as well as in the cross-section view of FIG. 8 taken along line 8 - 8 of FIG. 5 , edge 56 is positioned adjacently to edge 50 but does not overlap the foldover portion 46 .
  • Second web layer 54 overlapping at least a portion of foldover portion 46 as described in FIG. 10 hereinbelow.
  • Second web layer 54 includes a first portion 60 and a second portion 62 that, as shown in FIG. 8 , overlap the belly elastic thread portion 44 of the first web layer 30 .
  • Bonding apparatus 64 may be any known ultrasonic welding system in alternative embodiments, including, as non-limiting examples, a rotary ultrasonic welding system or a blade ultrasonic welding system.
  • bonding apparatus 64 includes a rotary anvil 66 and an ultrasonic fixed blade horn ultrasonic fixed blade horn 68 , also known as a sonotrode, which cooperate with each other to bond (i.e., fuse) the first web layer 30 to the second web layer 54 .
  • Alternative embodiments may include multiple fixed blade horns or one or more rotary horns.
  • first web layer 30 and second web layer 54 are depicted in FIG. 5 and described herein as physically separate components, it is contemplated that alternative embodiments may utilize a unitary web structure that is folded to capture the elastic threads 32 between upper and lower layers of the unitary web structure.
  • the portion of the unitary structure positioned below the elastic threads 32 would be referred to as the first web layer 30 and the portion of the unitary structure positioned above the elastic threads 32 would be referred to as the second web layer 54 .
  • a second folding apparatus similar to the folding apparatus 48 may be included to fold on portion of the unitary web structure over another portion of the unitary web structure to overlap the belly elastic thread portion 44 thereof.
  • Bonding apparatus 64 also includes one or more frames (not shown) that support and/or house a motor (not shown) that drives the ultrasonic horn 68 , a vibration control unit (not shown) that ultrasonically energizes the horn 68 and causes the horn 68 to vibrate, and a second motor (not shown) that drives the anvil 66 .
  • the horn 68 and anvil 66 are positioned in a spaced relationship relative to one another to facilitate ultrasonically bonding the first and second web layers 30 , 54 to one another while the elastic threads 32 are held in tension in the space between the horn 68 and anvil 66 .
  • first and second web layers 30 , 54 are exposed to an ultrasonic emission from the horn 68 that increases the vibration of the particles in the first and second web layers 30 , 54 .
  • the ultrasonic emission or energy is concentrated at specific bond points where frictional heat fuses the first and second web layers 30 , 54 together without the need for consumable adhesives.
  • bonding apparatus 64 is described herein as an ultrasonic bonding assembly that ultrasonically fuses first web layer 30 to second web layer 54 , it is contemplated that the techniques described herein may be extended to any other known welding or bonding techniques that fuse together two or more material layers without the use of adhesive, including sonic, thermal, or pressure bonding techniques and various other forms of welding known in the industry.
  • FIG. 9 a cross-sectional view of FIG. 5 taken along line 9 - 9 thereof shows the waist web 28 downstream of the second web layer 16 .
  • the foldover portion 46 of the first web layer 30 is fused to the waist elastic portion 42 of the first web layer 30 around the elastic threads 32
  • the second web layer 54 is fused to the belly elastic thread portion 44 of the first web layer 30 around the elastic threads 32 .
  • FIGS. 10-14 illustrate a manufacturing line 70 and manufactured waist web 28 according to another embodiment of the invention.
  • the embodiment of the manufacturing line 70 shown in FIGS. 10-14 differs from the manufacturing line 26 shown in FIGS. 5-9 in the position and overlap of the edge 56 of the second web layer 54 with respect to the first web layer 30 and the elastic threads 32 .
  • the remaining aspects, features, and components of manufacturing line 70 are identical or substantially similar to those of manufacturing line 26 described above and will not be repeated.
  • the second web layer 54 is brought into engagement with the first web layer 30 and the elastic threads 32 such that the edge 56 overlaps a portion of the foldover portion 46 of the first web layer 30 .
  • the edge 56 overlaps the entire foldover portion 46 ; however, other embodiments of more or less overlap are also contemplated.
  • FIG. 14 shows that the bonding carried out through the bonding apparatus 64 bonds the overlapping portion of the second web layer 54 directly to the foldover portion 46 without any adhesive therebetween.
  • FIGS. 15-18 illustrate a manufacturing line 72 and manufactured waist web 28 according to another embodiment of the invention.
  • the aspects, features, and components of manufacturing line 72 identical or substantially similar to those of manufacturing lines 26 or 70 described above will not be repeated.
  • the introduction of the second web layer 54 into the waist web assembly 28 occurs prior to the plow folder 48 and at the joining of the elastic threads 32 with the first web layer 30 at the roller assembly 36 .
  • All three layers then proceed downstream to the plow folder 48 , which folds over the foldover portion 46 of the first web layer 30 to overlap the edge 56 and adjacent portion of the second web layer 54 prior to bonding.
  • the foldover portion 46 is directly bonded to the edge 56 and adjacent portion of the second web layer 54 , which are in turn directly bonded to the waist elastic portion 42 of the first web layer 30 .
  • Manufacturing line 72 of FIG. 15 also can be used to manufacture the waist web 28 illustrated in FIG. 9 by varying the width of the second web layer 54 .
  • the second web layer 54 is introduced downstream from the plow folder 48 as illustrated in FIG. 15 , but is sized to cover only a portion of the elastics 32 (e.g., belly elastics 40 ).
  • First web layer 30 is then folded over the remaining elastics 32 (e.g., waist elastics 38 ) so that the edge of the first web layer 30 meets or is positioned adjacent the edge 56 of the second web layer 54 , resulting in the same waist web configuration shown in FIG. 8 .
  • FIGS. 19-22 illustrate a manufacturing line 74 and manufactured waist web 28 according to another embodiment of the invention.
  • the aspects, features, and components of manufacturing line 74 identical or substantially similar to those of manufacturing lines 26 , 70 , or 72 described above will not be repeated.
  • the edge 56 of the second web layer 54 shown in FIGS. 19-22 extends substantially as far as edge 50 of the first web layer 30 beyond the waist elastic threads 38 of the waist elastic portion 42 .
  • the edge 56 may not extend as far as illustrated.
  • Second web layer 54 includes a third portion 76 illustrated between the first and second portions 60 , 62 . Accordingly, both edges 50 , 56 are folded over via the plow folder 48 as illustrated in FIG. 21 to overlap both the third portion 76 of the second web layer 54 and the waist elastic portion 42 of the first web layer 30 and are bonded together to the third portion 76 of the second web layer 54 as illustrated in FIG. 22 .
  • Directly bonding the waist elastic portion 42 of the first web layer 30 to another portion of the first web layer 30 or to the second web layer 54 as described in the embodiments herein reduces the manufacturing steps required to make the waist cap in the waist web 28 . Because of the direct bonding, the additional step of applying an adhesive to the area to be joined by the waist elastic portion 42 is eliminated, and costs associated with using the adhesive in this area can also be eliminated.
  • FIGS. 23-27 illustrate a manufacturing line 78 and manufactured elastic bands 80 according to another embodiment of the invention.
  • Manufacturing line 78 includes the first web layer 30 and pairs of elastic thread groups 82 , 84 . While each thread group 82 , 84 is illustrated as including multiple threads, it is contemplated that either thread group 82 , 84 may include a single thread according to alternative embodiments.
  • the edges 50 , 52 of the first web layer 30 extend beyond the position of the elastic thread groups 82 , 84 as illustrated in FIGS. 23, 24 .
  • First web layer 30 includes a first elastic portion 86 configured to receive the elastic threads 82 and a second elastic portion 88 configured to receive the elastic threads 84 .
  • first web layer 30 includes a first foldover portion 90 configured to be folded over at least the elastic threads 82 and first elastic portion 86 and includes a second foldover portion 92 configured to be folded over at least the elastic threads 84 and second elastic portion 88 .
  • folding assembly 48 together with a second folding assembly 94 respectively fold over the first and second foldover portions 90 , 92 of first web layer 30 so as to overlap the first and second elastic portions 86 , 88 as illustrated in FIG. 25 .
  • the bonding apparatus 64 joins the first elastic portion 86 to the first foldover portion 90 and the second elastic portion 88 to the second foldover portion 92 as illustrated in FIG. 26 .
  • a cutting assembly 96 ( FIG. 23 ) is positioned to slit or cut the first web layer 30 into separate elastic bands 80 .
  • a rotary cutter or knife may be used to separate the first web layer 30 .
  • other cutting or slitting instruments such as fixed blades or knives or other methods known in the art may be used to separate the elastic bands 80 .
  • the cutting assembly 96 is shown downstream of the bonding apparatus 64 , embodiments of the invention contemplate positioning the cutting assembly 96 upstream of the bonding apparatus 64 to slit or cut the first web layer 30 prior to the bonding process of the bonding apparatus 64 .
  • second folding assembly 94 and foldover portion 92 eliminated and folding assembly 48 configured to fold foldover portion 90 such that foldover portion 90 overlaps both first and second elastic portions.
  • edge 50 may be substantially aligned with edge 52 if desired.
  • Cutting assembly 96 may separate the first web layer 30 into separate elastic bands 80 as described herein, and one elastic band 80 may have a folded edge on one side and two cut edges on the other side while the other elastic band 80 may have two cut edges on both sides.
  • anvil 66 is illustrated according to one embodiment of the invention.
  • the anvil 66 of includes an arrangement of discrete projections or welds 98 that extend outward from the anvil face 100 .
  • These welds 98 are constructed to (A) fuse first and second web layers 30 , 54 together and (B) restrain or anchor the elastic threads 32 in position relative to the first and second web layers 30 , 54 in the manufactured elastic composite structure.
  • anchoring projections 98 are designed so that an elastic thread 32 that passes between two adjacent anchoring projections 98 on the face 100 of anvil 66 is anchored in position relative to the first and second web layers 30 , 54 by frictional resistance that prevents the elastic thread 32 from sliding through the pair of resulting bonds.
  • roller assembly 36 includes guide rollers that are employed to accurately position and (optionally) tension the elastic threads 32 and the first and second web layers 30 , 54 as they travel toward the bonding apparatus 64 .
  • Roller assembly 36 includes include an upper roller 102 , a lower roller 104 , and a strand guide roller 106 that guide a combined web assembly 108 that includes the first web layer 30 , the second web layer 54 , and the elastic threads 32 into the roller assembly 36 . It is contemplated that rollers 102 , 104 , 106 may be replaced with other known types of feeding assemblies and/or replaced by a single roller unit or other known type of feeding assembly in an alternative embodiment.
  • anchoring projections 98 as well as the total number of projections 98 illustrated in FIG. 28 are intended to depict a representative and non-limiting example of an overall pattern of projections 98 on anvil 66 .
  • Alternative embodiments may include any number of projections 98 arranged in any number of alternative configurations to achieve a desired pattern of bonds on the end product.
  • the respective working surfaces of anchoring projections 98 may be configured to form bonds of similar size and shape, or bonds of different size and/or shape in alternative embodiments.
  • respective land surfaces of anchoring projections 98 may be circular, rectangular, crescent shaped, or have irregular shapes that may be selected to form a desired overall pattern on the end product.
  • the resulting pattern of bonds will include one or more anchored zones, which fix one or more elastic threads 32 under tension in position relative to the first and second web layers 30 , 54 .
  • anchoring projections 98 are formed on anvil 66 using a machining process that removes bulk material from the anvil 66 to create the desired raised pattern of projections 98 relative to the face 100 of the anvil 66 .
  • anchoring projections 98 may be provided on one or more inserts that are mechanically coupled to the face 100 of the anvil 66 .
  • working surface 110 of the horn 68 has a smooth or substantially smooth surface contour in one non-limiting embodiment.
  • working surface 110 may include an arrangement of projections 98 that mate or align with the pattern of projections 98 on the anvil 66 to further facilitate fusing the first web layer 30 to the second web layer 54 and securing the elastic threads 32 in position relative to the first and second web layers 30 , 54 .
  • the first and second web layers 30 , 54 are positioned between the face 100 of the anvil 66 and the working surface 110 of the horn 68 as shown in FIG. 28 .
  • Elastic threads 32 are positioned between the first and second web layers 30 , 54 in a tensioned state.
  • the position of horn 68 is controlled to maintain a nip gap 112 between the working surface 110 of horn 68 and the land surfaces 114 of the anchoring projections 98 .
  • the size of the nip gap 112 is determined based on parameters of the manufacturing process to facilitate bonding between the first and second web layers 30 , 54 .
  • Bonding apparatus 64 may include any known positioning means 116 that exerts a force on at least one of the horn 68 and anvil 66 to maintain a desired nip gap 112 between the horn 68 and anvil 66 .
  • Positioning means 116 may be an air pressure assembly (not shown) or a mechanical camshaft (not shown) as non-limiting examples.
  • Anchoring projections 98 may have a planar working surface, planar side surfaces, or some mixture of curved and straight working and side surfaces in alternative embodiments.
  • the land surface 114 of anchoring projection 98 has planar working and side surfaces.
  • this curved profile permits the first and second web layers 30 , 54 to slip relative to the face 100 of the anvil 66 during the bonding process and thus allows the velocity at which the combined assembly 108 including tensioned elastic strands 32 and first and second web layers 30 , 54 is advanced toward the bonding apparatus 64 to be increased or decreased relative to the rotational velocity of the anvil 66 .
  • the combined web/thread assembly 108 When the combined web/thread assembly 108 is advanced at a velocity greater than the velocity of the anvil 66 , the resulting bonds are spaced apart by a distance greater than the radial spacing between of adjacent projections 98 on the anvil face 100 . Similarly, slowing the feed rate of the combined web/thread assembly 108 relative to the velocity of the anvil 66 will result in bonds that are spaced apart by a distance less than the radial spacing between of adjacent projections 98 on the anvil face 100 .
  • the velocity mismatch or differential between web speed and anvil velocity can be controlled to accommodate size changes in the end product.
  • a manufacturing line of FIG. 5, 10, 15 , or 19 outfitted with an anvil that includes projections 98 with curved surface profiles thus provides for dynamic size changing without having to change the tooling set-up of the manufacturing line, as the same anvil can be used to manufacture multiple sizes of elastic composite structures for use in different sized products.
  • FIG. 30 is a flattened representation of the circumferential face 100 of anvil 66 according to an embodiment where anvil 66 includes a pattern of projections 118 that form anchored zones.
  • the pattern of projections 118 includes multiple anchoring weld lines 120 that are spaced apart from one another along the circumferential axis 122 of the anvil face 100 .
  • the anchoring weld lines 120 define an anchoring region 124 of the projection pattern 118 .
  • the anchoring weld lines 120 are formed on anvil 66 using a machining process that removes bulk material from the anvil 66 to create the desired raised pattern of anchoring weld lines 120 relative to the face 100 of the anvil 66 .
  • anchoring weld lines 120 may be provided on one or more inserts that are mechanically coupled to the face 100 of the anvil 66 .
  • FIG. 30 illustrates anchoring weld lines 120 that extend across substantially the entire longitudinal direction 126 of the rotary anvil 66 (e.g., lines 120 A) as well as shorter anchoring weld lines 120 (e.g., lines 120 B) that only partially extend along the longitudinal direction.
  • the longitudinal direction 126 generally extends in the cross-machine direction.
  • the bonds or joints formed by the section of the rotary anvil 66 absent the anchoring weld lines 120 B are spaced farther apart than the bonds formed by the section including the anchoring weld lines 120 B.
  • the closer-spaced bond joints formed by the section including the anchoring weld lines 120 B may be preferred when bonding the elastic threads 32 and first and second web layers 30 , 54 (not shown in FIG. 30 ; see FIGS.
  • each anchoring weld line 120 may be subject to the design of the bond pattern desired in the finished product.
  • each weld line 120 contains a pattern of discrete projections 128 , 130 that extend outward away from the face 100 of the anvil 66 .
  • the projections 128 , 130 are spaced apart from one another, by a notch 132 that is defined by the width of a gap 134 positioned between a given pair of adjacent projections 128 , 130 .
  • the width or size of the gap 134 may anchor one or more elastic threads 32 between adjacent bonds formed by projections 128 , 130 such that the elastic thread(s) 32 is held tightly between the adjacent bonds. In this manner, for example, the adjacent bonds constrain the elastic thread(s) 32 such that the elastic thread(s) 32 is retained between the adjacent bonds in the case of a breakage of the elastic thread(s) 32 .
  • Anvil 66 may in addition or alternatively include one or more projections that are referred to herein as laminating or non-anchoring projections 136 .
  • laminating or non-anchoring projections 136 As illustrated in FIG. 30 , a plurality of lamination projections 136 are shown in a lamination portion 138 of one of the anchoring weld lines 120 A.
  • Lamination projections 136 similar to the restraining or anchoring projections 128 , 130 , fuse first and second web layers 30 , 54 to one another.
  • Laminating projections 136 differ from anchoring projections 128 , 130 because they do not anchor the elastic threads 32 in position relative to the first and second web layers 30 , 54 .
  • laminating projections 136 are advantageous when laminating the first and second web layers 30 , 54 in areas designed for elastic deactivation in which the elastic threads 32 are purposely broken in order to create a non-elastic portion of the bonded web layers 30 , 54 . While only a few of the lamination projections 136 are illustrated in FIG. 30 , embodiments of the invention contemplate the use or non-use of any number and placement of the lamination projections 136 .
  • the contact surfaces 140 of the projections 128 , 130 may have different geometries in alternative embodiments.
  • projections 128 , 130 may be circular, rectangular, crescent shaped, or have irregular shapes that may be selected to form a desired overall pattern on the end product.
  • corresponding projections 128 , 130 of adjacent weld lines 120 may be aligned with one another in a line parallel to the circumferential axis 122 .
  • projections 128 , 130 of sequential weld lines 120 may be offset from one another in the cross-machine direction thereby defining a stepped or non-linear passage through the bond lines that are formed on the first and second web layers 30 , 54 .
  • FIG. 31 illustrates a non-linear arrangement of the anchoring weld lines 120 according to another embodiment of the invention.
  • a sinusoidal pattern is shown that, when the elastic threads 32 and first and second web layers 30 , 54 are bonded together, creates a distinctive gathering pattern as compared with the gathering pattern formed using the linear arrangement shown in FIG. 30 .
  • other arrangement patterns may be formed into the anchoring weld lines 120 in other embodiments of the invention. Such other arrangement patterns may bond the elastic threads 32 and first and second web layers 30 , 54 together in geometric or other patterns arranged in straight lines, curved lines, or otherwise arranged to create logos, pictures, other continuous and repeating patterns, or other designs on the end product.
  • an elastic composite structure includes a first web layer comprising a first portion, a second portion, and a third portion; a second web layer comprising a first portion and a second portion; and a plurality of elastic threads positioned adjacently to the second and third portions of the first web layer.
  • the first portion of the first web layer is folded over and overlaps the second portion of the first web layer.
  • the folded first portion of the first web layer is directly bonded to one of the second portion of the first web layer and the first portion of the second web layer.
  • a first portion of the plurality of elastic threads is constrained between the folded first portion of the first web layer and the second portion of the first web layer absent adhesive.
  • the third portion of the first web layer is directly bonded to the second portion of the second web layer and traps a second portion of the plurality of elastic threads therebetween.
  • a method of forming an elastic composite structure includes providing a first web layer comprising a first portion, a second portion, and a third portion; threading a plurality of elastic threads adjacently to the second and third portions of the first web layer; and providing a second web layer comprising a first portion and a second portion.
  • the method also includes folding the first portion of the first web layer over the second portion of the first web layer and bonding the folded first portion of the first web to one of the second portion of the first web layer and the first portion of the second web layer.
  • the method further includes bonding the third portion of the first web layer to the second portion of the second web layer.
  • a first portion of the plurality of elastic threads is trapped between the first and second portions of the first layer absent adhesive and a second portion of the plurality of elastic threads is trapped between the third portion of the first web layer and the second portion of the second web layer.
  • an apparatus for forming an elastic composite structure includes a plurality of rollers configured to guide a combined web assembly in a machine direction.
  • the combined web assembly includes a first web layer comprising a first portion, a second portion, and a third portion; a second web layer comprising a first portion and a second portion; and a plurality of elastic threads positioned between the first and second web layers.
  • the apparatus also includes a folding apparatus configured to fold the first portion of the first web layer over the second portion of the first web layer and a bonding apparatus configured to bond the folded first portion of the first web layer to one of the second portion of the first web layer and the first portion of the second web layer such that a first portion of the plurality of elastic threads is trapped between the folded first portion of the first layer and the second portion of the first layer absent adhesive.
  • the bonding apparatus is also configured to bond the third portion of the first web layer to the second portion of the second web layer such that a second portion of the plurality of elastic threads is trapped between the third portion of the first web layer to the second portion of the second web layer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Manufacturing & Machinery (AREA)
  • Textile Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)
  • Prostheses (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
US16/947,236 2019-09-04 2020-07-24 Elastic entrapment with waist cap bonding Pending US20210059866A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/947,236 US20210059866A1 (en) 2019-09-04 2020-07-24 Elastic entrapment with waist cap bonding

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201962895645P 2019-09-04 2019-09-04
US16/947,236 US20210059866A1 (en) 2019-09-04 2020-07-24 Elastic entrapment with waist cap bonding

Publications (1)

Publication Number Publication Date
US20210059866A1 true US20210059866A1 (en) 2021-03-04

Family

ID=72086678

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/947,236 Pending US20210059866A1 (en) 2019-09-04 2020-07-24 Elastic entrapment with waist cap bonding

Country Status (9)

Country Link
US (1) US20210059866A1 (de)
EP (2) EP4306304A3 (de)
JP (1) JP2021037276A (de)
CA (1) CA3088206A1 (de)
DE (1) DE202020005962U1 (de)
DK (1) DK3788997T3 (de)
ES (1) ES2972369T3 (de)
MX (1) MX2020008045A (de)
PL (1) PL3788997T3 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11690767B2 (en) 2014-08-26 2023-07-04 Curt G. Joa, Inc. Apparatus and methods for securing elastic to a carrier web
US11701268B2 (en) 2018-01-29 2023-07-18 Curt G. Joa, Inc. Apparatus and method of manufacturing an elastic composite structure for an absorbent sanitary product
US11744744B2 (en) 2019-09-05 2023-09-05 Curt G. Joa, Inc. Curved elastic with entrapment
US11925538B2 (en) 2019-01-07 2024-03-12 Curt G. Joa, Inc. Apparatus and method of manufacturing an elastic composite structure for an absorbent sanitary product

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110098668A1 (en) * 2009-10-23 2011-04-28 Thorson Russell E Disposable absorbent garments employing elastomeric film laminate body panels
US9028462B2 (en) * 2011-06-15 2015-05-12 Kimberly-Clark Worldwide, Inc. Disposable absorbent garment having colored facings and integral waistband
WO2018097771A1 (en) * 2016-11-23 2018-05-31 Essity Hygiene And Health Aktiebolag Absorbent article with folded edges to enclose elastic elements and method for manufacturing an absorbent article with folded edges
WO2019125415A1 (en) * 2017-12-19 2019-06-27 Kimberly-Clark Worldwide, Inc. Absorbent articles with visually different chassis and waistbands
US20190274895A1 (en) * 2018-03-06 2019-09-12 The Procter & Gamble Company Wearable article comprising an elastic laminate

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6032683B2 (ja) * 2014-03-13 2016-11-30 大王製紙株式会社 パンツタイプ使い捨ておむつの製造方法、及びその製造方法により製造可能なパンツタイプ使い捨ておむつ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110098668A1 (en) * 2009-10-23 2011-04-28 Thorson Russell E Disposable absorbent garments employing elastomeric film laminate body panels
US9028462B2 (en) * 2011-06-15 2015-05-12 Kimberly-Clark Worldwide, Inc. Disposable absorbent garment having colored facings and integral waistband
WO2018097771A1 (en) * 2016-11-23 2018-05-31 Essity Hygiene And Health Aktiebolag Absorbent article with folded edges to enclose elastic elements and method for manufacturing an absorbent article with folded edges
WO2019125415A1 (en) * 2017-12-19 2019-06-27 Kimberly-Clark Worldwide, Inc. Absorbent articles with visually different chassis and waistbands
US20190274895A1 (en) * 2018-03-06 2019-09-12 The Procter & Gamble Company Wearable article comprising an elastic laminate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11690767B2 (en) 2014-08-26 2023-07-04 Curt G. Joa, Inc. Apparatus and methods for securing elastic to a carrier web
US11701268B2 (en) 2018-01-29 2023-07-18 Curt G. Joa, Inc. Apparatus and method of manufacturing an elastic composite structure for an absorbent sanitary product
US11925538B2 (en) 2019-01-07 2024-03-12 Curt G. Joa, Inc. Apparatus and method of manufacturing an elastic composite structure for an absorbent sanitary product
US11744744B2 (en) 2019-09-05 2023-09-05 Curt G. Joa, Inc. Curved elastic with entrapment

Also Published As

Publication number Publication date
EP4306304A3 (de) 2024-03-20
ES2972369T3 (es) 2024-06-12
DK3788997T3 (da) 2024-03-04
EP3788997B1 (de) 2024-01-10
CA3088206A1 (en) 2021-03-04
EP3788997A1 (de) 2021-03-10
JP2021037276A (ja) 2021-03-11
DE202020005962U1 (de) 2023-10-25
PL3788997T3 (pl) 2024-04-29
EP4306304A2 (de) 2024-01-17
MX2020008045A (es) 2021-03-05

Similar Documents

Publication Publication Date Title
US11903801B2 (en) Apparatus and method of manufacturing an elastic composite structure for an absorbent sanitary product
US20210059866A1 (en) Elastic entrapment with waist cap bonding
US20240252362A1 (en) Apparatus and method of manufacturing an elastic composite structure for an absorbent sanitary product
US7708849B2 (en) Apparatus and method for cutting elastic strands between layers of carrier webs
US20200297551A1 (en) Apparatus and method of manufacturing an elastic composite structure for an absorbent sanitary product
US11173072B2 (en) Curved elastic with entrapment
JP5728214B2 (ja) 超音波接合装置、それを用いたウエブの接合方法及びそれを用いたパンツ型着用物品の製造方法
US20230101562A1 (en) An elastic composite structure for an absorbent sanitary product and an apparatus and method for making said elastic composite structure
JP6189111B2 (ja) パンツ型使い捨ておむつ
US20230143833A1 (en) Elasticized waistband for use in an absorbent garment and method of making same

Legal Events

Date Code Title Description
AS Assignment

Owner name: CURT G. JOA, INC., WISCONSIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FRITZ, JEFFREY W.;SCHUETTE, DAVID E.;SIGNING DATES FROM 20190829 TO 20190903;REEL/FRAME:053300/0572

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: FINAL REJECTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER